Sound reproducer



June '11, 1929. u IW, C, JQNES 1,717,158

SOUN1\) REPRODUCER Filed April 13,1928

@lfm 2 /fwf/v 70H WAR/PEN C- JUA/5.5

A TTM/VD( l excited to set up a flux in a magnetic circuit- 2 in whichthere isan annular air-gap 3.. i A4 Patented June 11, 1929.

UNITED STATES l 1` ..Ti;11-1-T orner..

` WARREN c. JoNEs, orrnusnma NEW YORK, Ass'IGNoa fro BELL TELEPHONEmnoEA'roaIEs, 'mooaronATEn or NEW YORK, N. Y., A coEroaArIoN or NEW YoanSOUND RErRotUcEn. l

Application led April 18,1928, Serial IIa-270,920

ly the diaphragm to which-the coil'is at-4 tached, in accordance withthe current variations. -The coil leads'are necessarily of very smallcross section and oftenv break under the constant flexing action unlessspecial pre-- cautions are taken. f

' v15 LThe generar object f this invention "is therefore to prevent thebreaking of such lead wires.

-In accordance with the generalfeatures of.

f thisV invention the coil leads are run looselyin conduits Vwhichextend outwardly to binding posts beyond the `periphery of the dia-a Aphragm. 'Ihe4 conduits are rigidly attached' to the diaphragmand-vibrate freely with it and the ilexingaction is thereby distributedl 25 over such a length .of conductor thatbreaking is eliminated. In-thedrawing Fig. 1 is a sectional view ofja movingcoil type receiverembodying the present invention; f Fig. 2 is a plan view looking upwardatthe diaphragm and showing the location of thel lead conduits; and Fig.3 is a detailed view of the lead wire' In a copending application of E.CfWente No. 127 ,023, filed August 4, 1926 there is def scribed areceiver of the same general ,type "as the one used to illustrate theJpresent i nvention.

Referring -to Fig. 1 a circular field coill is coil 4,`co'nsisting ofa'n'u'mber of turns of fine yWire, is rigidly attached to a diaphragm 5,

A.45 The current -'variations corresponding to'the sound -to bereproduced traverse this coil and. by their interaction .with themagnetic 1 lengths;

tion to the diaphragm.

Currents are led to the coil'5 through conductors or lead Wires 7, 7which are preferfield inair-gap 3 impart a corresponding moablyco'ntinuations of the conductor comprisl ing the coil. The lead wires 7,7 arecarried to the terminals of the operating circuit through conduits6, 6 composed'of alight weight insulating material and of sullicientinternal diameter to permit free movement of the lead 'wires 7, -7r whenthe diaphragm is vibrated; a

The conduits 6, 6 are'secured to the diaphragm by some -suitablecementing sub# stance such as shellac andv are preferably long -nough toextend under a clamping ring to a point near bindin A posts 9, 9.

- Vhat-is claime 1s: #1." In a telephone receiver, in combination,

a diaphragm, means for producing a'magnetc field, a coil rigidly securedtothe diaphragm and located in said magnetic eld,

connecting conductors extending from the coil to points adjacent theperiphery of the diaphragm, and conduitssecured to the diaphragm through-which the connecting conductors extend, the inside diameter oftheconduits being greater than the outside diam-A eter of the connectingconductors whereby flexing action of the conductors in response to thevibrations of the diaphragm is -dlstribut'- ed over the length oftheconductors.

2. In a telephone'receivenin combination,

a diaphragm, means for producing a -magnetic field, a'lcoil of lessdiameter than the diaphragm rigidly secured in concentric-relation. t0the diaphragm and located in said magnetic 4lield,' conducting 4leadsextending from the energizing coil to the periphery of aphragm forsupporting thefcondcting leads in guided but unrestricted vibrationalrelation to j the diaphragm throughout their In witness whereof,I-hereunt'o subscribe by name this 4th `day of April, 1928.

-the diaphragm, and means carried by the di- WARREN o. IoNEs.

